138971610 has 24 divisors (see below), whose sum is σ = 361326420. Its totient is φ = 37059072.

The previous prime is 138971579. The next prime is 138971611. The reversal of 138971610 is 16179831.

138971610 is a `hidden beast` number, since 1 + 38 + 9 + 7 + 1 + 610 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 136118889 + 2852721 = 11667^2 + 1689^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (138971611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 771975 + ... + 772154.

Almost surely, 2^138971610 is an apocalyptic number.

138971610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138971610 is an abundant number, since it is smaller than the sum of its proper divisors (222354810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138971610 is a wasteful number, since it uses less digits than its factorization.

138971610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544142 (or 1544139 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 138971610 is about 11788.6220568818. The cubic root of 138971610 is about 517.9748774109.

The spelling of 138971610 in words is "one hundred thirty-eight million, nine hundred seventy-one thousand, six hundred ten".